(medicine) The act of looking sideways, to the left or right, by moving only one's eyes.
1930, Ray Cummings, “Section 4, Ch. 28, "The Ascent of Archimedes"”, in "Brigands of the Moon: Part Three of a Four-part Novel" in Astounding Stories of Super-Science, May and June 1930:
"His light wentout very promptly, didn't it?" She flashed me a sidegaze. Were we acting convincingly?
1984, Joseph Lang, Strabismus, →ISBN, page 127:
Gaze is almost never straight ahead but varies between downgaze, sidegaze, and upgaze. Correct fixation of an object does not take place.